Class: Cplus2Ruby::CppCodeGenerator

Inherits:
CodeGenerator show all
Defined in:
lib/cplus2ruby/cpp_code_generator.rb

Constant Summary collapse

DEFAULT_INCLUDES = 
[:"stdlib.h", "ruby.h"]

Instance Method Summary collapse

Methods inherited from CodeGenerator

#all_methods_of, #all_properties_of, #args_convertable?, #arity, #initialize, #no_wrap?, #wrap?, #write_out

Constructor Details

This class inherits a constructor from Cplus2Ruby::CodeGenerator

Instance Method Details

#gen_class_declaration(klass) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 157

def gen_class_declaration(klass)
  if klass.superclass == Object
    sc = "RubyObject"
  else
    sc = klass.superclass.name
  end

  #
  # Do we have free or mark methods defined?
  #
  m = {}
  [:free, :mark].each do |kind|
    if not stmts_for_free_or_mark_method(klass, kind).empty?
      m[kind] = "virtual void __#{kind}__();"
    end
  end

  #
  # Write out property declarations and method signatures.
  #
  stmts = []

  all_properties_of(klass) {|name, options| 
    stmts << gen_property(name, options)
  }

  all_methods_of(klass) {|name, options|
    stmts << gen_method(nil, name, options, options[:inline], true)
  }
     
  if no_wrap?(klass)
    %[
      struct #{klass.name} 
      {
        #{stmts.join("; \n")};
      };
    ]
  else
    %[
      struct #{klass.name} : #{sc}
      {
        typedef #{sc} super;

        #{klass.name}();

        #{m[:free]}
        #{m[:mark]}
        
        #{stmts.join("; \n")};
      };
    ]
  end
end

#gen_class_impl(klass) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 211

def gen_class_impl(klass)
  # FIXME: helper_codes

  stmts = [] 

  if wrap?(klass)
    stmts << gen_constructor(klass)

    [:free, :mark].each {|kind| 
      stmts << gen_free_or_mark_method(klass, kind)
    }
  end

  all_methods_of(klass) do |name, options|
    next if options[:inline]
    stmts << gen_method(klass.name, name, options, true, false)
  end

  stmts.join("\n")
end

#gen_constructor(klass) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 62

def gen_constructor(klass)
  stmts = []
  all_properties_of(klass) do |name, options|
    init = @model.typing.lookup_entry(:init, options, options[:type])
    stmts << @model.typing.var_assgn("this->#{name}", init) unless init.nil?
  end
  #return "" if stmts.empty?
  %[
    #{klass.name}::#{klass.name}()
    {
      #{stmts.join(";\n")};
    }
  ]
end

#gen_free_or_mark_method(klass, kind) ⇒ Object

kind is either :free or :mark



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 50

def gen_free_or_mark_method(klass, kind)
  stmts = stmts_for_free_or_mark_method(klass, kind)
  return "" if stmts.empty?
  stmts << "super::__#{kind}__()"
  %[
    void #{klass.name}::__#{kind}__()
    {
      #{stmts.join(";\n")};
    }
  ]
end

#gen_header_file ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 232

def gen_header_file
  out = ""
  out << gen_includes(DEFAULT_INCLUDES + @model.includes)
  out << gen_rubyObject()
  out << gen_type_aliases(@model.typing.aliases)
  out << @model.code

  # forward class declarations
  @model.entities_ordered.each do |klass|
    out << "struct #{klass.name};\n"
  end

  # FIXME: helper_headers

  #
  # class declarations
  #
  @model.entities_ordered.each do |klass|
    out << gen_class_declaration(klass)
  end

  return out
end

#gen_impl_file(mod_name) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 256

def gen_impl_file(mod_name)
  out = ""
  out << %{#include "#{mod_name}.h"\n\n}

  #
  # class declarations
  #
  @model.entities_ordered.each do |klass|
    out << gen_class_impl(klass)
  end

  return out
end

#gen_include(inc) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 20

def gen_include(inc)
  "#include " + 
  case inc
  when Symbol
    %{<#{inc}>}
  when String
    %{"#{inc}"}
  else
    raise ArgumentError, "invalid header"
  end
end

#gen_includes(includes) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 32

def gen_includes(includes)
  includes.map {|inc| gen_include(inc) }.join("\n")
end

#gen_method(klassname, name, options, include_body, is_declaration) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 151

def gen_method(klassname, name, options, include_body, is_declaration)
  str = gen_method_sig(klassname, name, options, is_declaration)
  str << gen_method_body(klassname, name, options) if include_body
  str
end

#gen_method_body(klassname, name, options) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 107

def gen_method_body(klassname, name, options)
  if options[:stub]
    gen_stub_method(klassname, name, options)
  else
    "{\n" + (options[:body] || @model.settings[:default_body_when_nil]) + "}\n"
  end
end

#gen_method_sig(klassname, name, options, is_declaration) ⇒ Object

If klassname is nil, then it doesn’t include the

Klassname

prefix.

Doesn’t include the semicolon at the end.



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 87

def gen_method_sig(klassname, name, options, is_declaration)
  args = options[:arguments].dup
  returns = args.delete(:returns) || "void"

  out = ""
  if is_declaration
    out << "static " if options[:static] 
    out << "inline " if options[:inline]
    out << "virtual " if options[:virtual]
  end
  out << @model.typing.var_decl(returns, "")
  out << " "

  s = args.map {|aname, atype| @model.typing.var_decl(atype, aname) }.join(", ")

  out << "#{klassname}::" if klassname
  out << "#{name}(#{s})"
  return out
end

#gen_property(name, options) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 77

def gen_property(name, options)
  @model.typing.var_decl(options[:type], name)
end

#gen_rubyObject ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 6

def gen_rubyObject
  %[
    struct RubyObject {
      VALUE __obj__;
      RubyObject() { __obj__ = Qnil; }
      virtual ~RubyObject() {};
      static void __free(void *ptr) { ((RubyObject*)ptr)->__free__(); }
      static void __mark(void *ptr) { ((RubyObject*)ptr)->__mark__(); }
      virtual void __free__() { delete this; }
      virtual void __mark__() { }
    };
  ]
end

#gen_stub_method(klassname, name, options) ⇒ Object

Generates a C++ method that forwards the call to the Ruby method of the same name.



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 119

def gen_stub_method(klassname, name, options)
  raise "Stub method with body is invalid!" if options[:body]

  args = options[:arguments].dup
  unless args_convertable?(args)
    raise "ERROR: Cannot convert stub method #{klassname}::#{name}"
  end

  returns = args.delete(:returns) || "void"

  out = ""
  out << "{\n"
  out << "VALUE __res__ = " if returns != 'void'

  # TODO: move rb_intern out
  call_args = ["@__obj__", %{rb_intern("#{name}")}, args.size] + 
    args.map {|n, k| @model.typing.convert(k, n, :c2ruby) }

  out << %{rb_funcall(#{call_args.join(', ')});}

  # check return type
  if returns != 'void' 
    out << @model.typing.convert(returns, '__res__', :ruby2c_checktype)
    retval = @model.typing.convert(returns, '__res__', :ruby2c) 
    out << "return #{retval};\n"
  end

  out << "}\n"

  return out
end

#gen_type_alias(from, to) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 36

def gen_type_alias(from, to)
  "typedef #{to} #{from};"
end

#gen_type_aliases(type_aliases) ⇒ Object

Type aliases is a hash in the form from => to.



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 43

def gen_type_aliases(type_aliases)
  type_aliases.map {|from, to| gen_type_alias(from, to) }.join("\n")
end

#write_files(mod_name) ⇒ Object 



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# File 'lib/cplus2ruby/cpp_code_generator.rb', line 270

def write_files(mod_name)
  write_out(mod_name + ".h", gen_header_file())
  write_out(mod_name + ".cc", gen_impl_file(mod_name))
end